1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Householder transformation for A=QR

  1. May 1, 2007 #1
    In one of my homework questions, it requires me to reduce A (a 3X3 matrix) into QR by Householder transformation.

    A is defined as
    4 1 1
    2 4 1
    0 1 4

    However, when I use Householder transformation for column 1, I use to use a = I - 2*vv^T/(v^Tv). However, I find that v^Tv = 0. Since vv^T is a matrix and i have (2/0)*vv^T. So, I stuck at this point and cannot continue to do this question.

    Can anyone tell me what was wrong in my idea or are their solutions to this problem? Thanks.

  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted

Similar Discussions: Householder transformation for A=QR
  1. Householder matrix (Replies: 7)

  2. QR factorization (Replies: 1)

  3. A = QR Decomposition (Replies: 4)

  4. QR Factorization (Replies: 2)